`PUT /dashboards/{name}` had no backend test: three cover what it promises —
a first draft for a name nobody has used (200, not the 404 that came off in
b2466bf), an update that keeps everything the edit did not name, and a save
based on a version someone moved past.
The Playwright half is the same property through the editor. Pages and
sections are gone since 9ec38d4, so what the editor never draws — a widget's
md/sm placements and the dashboard-wide settings — is what a save has to
carry, and dragging one widget is what the spec makes it carry it through.
stroblme